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Solution filtration method for polycarbonate purification

  • US 20030111415A1
  • Filed: 12/10/2001
  • Published: 06/19/2003
  • Est. Priority Date: 12/10/2001
  • Status: Abandoned Application
First Claim
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1. A method for purifying polycarbonate, which method comprises passing a solution comprising polycarbonate and methylene chloride through a filtration system having filters, wherein the filtration system reduces the level of particulates having a size greater than 0.5 microns to below 10,000 per gram of the solution, and the filtration system is continuously operated for a period of greater than 15 days without switching or cleaning a filter.

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